HyukjinKwon commented on a change in pull request #33638:
URL: https://github.com/apache/spark/pull/33638#discussion_r683062569
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File path: docs/sql-ref-ansi-compliance.md
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@@ -257,6 +257,15 @@ The behavior of some SQL operators can be different under
ANSI mode (`spark.sql.
- `map_col[key]`: This operator throws `NoSuchElementException` if key does
not exist in map.
- `GROUP BY`: aliases in a select list can not be used in GROUP BY clauses.
Each column referenced in a GROUP BY clause shall unambiguously reference a
column of the table resulting from the FROM clause.
+### Special functions for using the ANSI dialect
Review comment:
Maybe ...
```suggestion
### Useful Functions for ANSI Mode
```
since the functions are not dependent on ANSI mode conf
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